127640639 has 24 divisors (see below), whose sum is σ = 159175008. Its totient is φ = 101787840.

The previous prime is 127640627. The next prime is 127640677. The reversal of 127640639 is 936046721.

It is not a de Polignac number, because 127640639 - 2¹⁶ = 127575103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127642639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40169 + ... + 43229.

It is an arithmetic number, because the mean of its divisors is an integer number (6632292).

Almost surely, 2^127640639 is an apocalyptic number.

127640639 is a deficient number, since it is larger than the sum of its proper divisors (31534369).

127640639 is a wasteful number, since it uses less digits than its factorization.

127640639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135 (or 3128 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 127640639 is about 11297.8156738371. The cubic root of 127640639 is about 503.4963461395.

The spelling of 127640639 in words is "one hundred twenty-seven million, six hundred forty thousand, six hundred thirty-nine".